Korean Journal of Agricultural Science最新文献

{"title":"Machine learning application for predicting the strawberry harvesting time","authors":"Yang Mihye, Won-Ho Nam, Kim, Taegon, Kwanho Lee, Young Hwa Kim","doi":"10.7744/KJOAS.20190026","DOIUrl":"https://doi.org/10.7744/KJOAS.20190026","url":null,"abstract":"A smart farm is a system that combines information and communication technology (ICT), internet of things (IoT), and agricultural technology that enable a farm to operate with minimal labor and to automatically control of a greenhouse environment. Machine learning based on recently data-driven techniques has emerged with big data technologies and high-performance computing to create opportunities to quantify data intensive processes in agricultural operational environments. This paper presents research on the application of machine learning technology to diagnose the growth status of crops and predicting the harvest time of strawberries in a greenhouse according to image processing techniques. To classify the growth stages of the strawberries, we used object inference and detection with machine learning model based on deep learning neural networks and TensorFlow. The classification accuracy was compared based on the training data volume and training epoch. As a result, it was able to classify with an accuracy of over 90% with 200 training images and 8,000 training steps. The detection and classification of the strawberry maturities could be identified with an accuracy of over 90% at the mature and over mature stages of the strawberries. Concurrently, the experimental results are promising, and they show that this approach can be applied to develop a machine learning model for predicting the strawberry harvesting time and can be used to provide key decision support information to both farmers and policy makers about optimal harvest times and harvest planning.","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"55 1","pages":"381-393"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91298653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Glycine soja and hairy vetch supplementation on the nutritional quality of corn silage","authors":"K. Jung, Chohyunmin, Hyung-Suk Lee, Heo, Jung Min, Lee, Soo-Kee","doi":"10.7744/KJOAS.20180015","DOIUrl":"https://doi.org/10.7744/KJOAS.20180015","url":null,"abstract":"조사료 자원의 확보도 농후사료와 마찬가지로 날로 열악해지고 있다. 이를 해결하는 방법으로 새 로운 사료자원을 개발하는 것과 기존 사료의 이용 효율을 높이는 것을 생각할 수 있다. 우리나라 조 사료의 주종은 아직 볏짚이며 이에 대한 의존도를 낮추는 것이 시급한 과제이며 이제까지의 정책이 동계작물에 치우친 면이 있으며 이 또한 재배 면적이 한계점에 도달한 것으로 보여진다(Kim et al., 2017). 따라서 동계작물의 지속적 재배도 중요하지만, 아울러 하계 작물의 증산도 도모하여야 한다. 하계 작물로는 옥수수, 수수, 수단그래스, 수수 × 수단그래스 교잡종 등이 있으나 이들은 조단백질 함량 이 적은 것이 단점이다(Darby and Lauer, 2002). 특히 옥수수는 두과 사료작물과 같이 재배할 경우 생산성(Ahmed and Rao, 1982; Singh et al., 1986; Martin et al., 1990)과 품질(Putnam et al., OPEN ACCESS","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"35 1","pages":"169-176"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81726348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of different types of biochar on the growth of Chinese cabbage (Brassica chinensis )","authors":"Jae-Han Lee, Chang-Jun Seong, Seong-Soo Kang, H. Lee, Soo-Hun Kim, Ji–Sun Lim, -. Jae, H. Kim, J. Yoo, J. Park, T. Oh","doi":"10.7744/kjoas.20180033","DOIUrl":"https://doi.org/10.7744/kjoas.20180033","url":null,"abstract":"Accepted: May 11, 2018 Revised: April 27, 2018 Received: April 16, 2018 Editor: Jwakyung Sung, National Institute of Agricultural Sciences DOI: Citation: Lee JH, Seong CJ, Kang SS, Lee HC, Kim SH, Lim JS, Kim JH, Yoo JH, Park JH, Oh TK. 2018.Effect of different types of biochar on the growth of Chinese cabbage (Brassica chinensis). Korean Journal of Agricultural Science. https://doi.org/10.7744/kjoas.20180033 *Corresponding author:","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"31 1","pages":"197-203"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88695938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of restricted feeding with fermented whole-crop barley and wheat on the growth performance, nutrient digestibility, blood characteristic, and fecal microbiota in finishing pigs","authors":"C. Lee, 김현범, J. Ahn, 정현정, Yun Won, Lee Ji Hwan, Kwakwoogi, H. Oh, Shudong Liu, J. An, T. Song, T. Park, Doowan Kim, 유동조, 송민호, 조진호","doi":"10.7744/KJOAS.20180064","DOIUrl":"https://doi.org/10.7744/KJOAS.20180064","url":null,"abstract":"A total of 80 pigs [(Landrace × Yorkshire) × Duroc] with an average body weight of 72.9 ± 2.6 kg were used in the present study to investigate the effects of fermented whole crop wheat and barley with or without supplementing inoculums throughout the restricted feeding in finishing pigs. There were 4 replicate pens per treatment. Pigs were fed ad libitum throughout the experiment as the control (CON), and the other four groups were restricted to 10% in the CON diet and fed ad libitum fermented whole crop cereals: fermented whole crop barley with inoculums; fermented whole crop barley without inoculums; fermented whole crop wheat with inoculums; and fermented whole crop wheat without inoculums. During the entire experiment, the average daily feed intake (ADFI) decreased in the fermented barley and fermented wheat groups compared to the CON, while no difference was observed in the average daily gain (ADG), feed efficiency (gain : feed ratio, G : F) between the control and fermented whole crop barley, wheat diet group. Dry matter and nitrogen digestibility did not show a significant difference among the treatments. In the blood constituents, concentrations of blood urea nitrogen were significantly lower in pigs fed fermented whole crop barley without inoculum diets compared with the other treatments. In conclusion, restricted feeding with fermented whole crop barley and wheat regardless of the supplementing inoculums showed no significant difference in growth performance compared to the CON. This suggests that there is a possibility that fermented whole crop barley and wheat could replace part of the conventional diets. OPEN ACCESS Accepted: September 5, 2018 Revised: August 10, 2018 Received: June 20, 2018 DOI: Citation: CH Lee, HB Kim, JH Ahn, HJ Jung, W Yun, JH Lee, WG Kwak, HJ Oh, SD Liu, JS An, TH Song, TI Park, DW Kim, DJ Yu, MH Song, JiH Cho. 2018. Effects of restricted feeding with fermented whole-crop barley and wheat on the growth performance, nutrient digestibility, blood characteristic, and fecal microbiota in finishing pigs. Korean Journal of Agricultural Science. https:// doi.org/10.7744/kjoas.20180064 pISSN : 2466-2402 eISSN : 2466-2410 Effects of restricted feeding with fermented whole-crop barley and wheat on the growth performance, nutrient digestibility, blood characteristic, and fecal microbiota in finishing pigs Korean Journal of Agricultural Science 45(4) December 2018 666","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"50 1","pages":"665-675"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89780006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of gene flow from GM to non-GM soybeans by the size of the pollen donor","authors":"Lee Bum-Kyu, Sung‐Dug Oh, 장안철","doi":"10.7744/KJOAS.20180078","DOIUrl":"https://doi.org/10.7744/KJOAS.20180078","url":null,"abstract":"The use of genetically modified (GM) crops has increased continuously over the world, and concerns about the potential risks of GM crops have also risen. Although, until now, GM crops have not been cultivated commercially in Korea, it is necessary to develop technology for the safe evaluation of GM crops. In this study, we investigated the influence of gene flow from GM to non-GM soybeans by the size of the pollen donor. In the experimental design, GM soybeans were placed in the center as a pollen donor and non-GM soybeans were placed in four directions as the pollen receivers. Three sizes of pollen donor were designed as 90 cm × 90 cm, 180 cm × 180 cm, and 360 cm × 360 cm. A total 22,719 seeds were collected from nonGM soybeans, and 14 hybrids were finally obtained through herbicide resistance screening and PCR analysis. The highest hybridization rate was 0.78% at a distance of 15 cm from a 360 cm × 360 cm GM pollen donor, and the farthest distance of hybridization was 180 cm from a GM pollen donor which was 360 cm × 360 cm in size. Ten hybrids were found among the 14 hybrids at the 360 cm × 360 cm pollen donor size, 3 hybrids at 180 cm × 180 cm, 1 hybrid at 90 cm × 90 cm. From these results, it could be concluded that with the larger pollen donor size, more hybridization occurred in soybeans.","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"12 1","pages":"591-600"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86700965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth performance of Korean crossbred domestic chickens for 12 weeks after post hatching","authors":"J. Hong, Chohyunmin, S. Wickramasuriya, T. Shin, 김은주, 허정민, Y. Yi","doi":"10.7744/kjoas.20180065","DOIUrl":"https://doi.org/10.7744/kjoas.20180065","url":null,"abstract":"This study was conducted to investigate the growth performance between six different Korean crossbred native chickens. A total of 312 one-day-old male chickens from the same paternal line with six different maternal lines were allocated into six groups (1A, 2A, 3A, 4A, 5A, and 6A) to give four replicate cages (13 birds per cage). Corn soybean meal based diets were provided as a starter (0 5 weeks: 20% crude protein [CP] and 3,050 kcal/kg metabolizable energy [ME]), grower (5 8 weeks: 18% CP, 3 and 100 kcal/kg ME) and finisher (8 12 weeks: 17% CP and 3,150 kcal/kg ME) diet. Chickens were able to access their respective feed and water ad libitum. In week 2, 2A had a lower body weight (p < 0.05) than that of the other groups. In contrast, in weeks 4 and 8, 2A had a higher body weight (p < 0.05). Similarly, in week 6, 2A had a higher body weight (p = 0.76) than that of the others. However, no difference (p > 0.05) was observed in the body weight after week 10. Meanwhile, 2A had a lower feed conversion ratio (FCR) than that of the other groups (p < 0.05) and a higher average daily feed intake (ADFI; p < 0.05) compared to the other groups in week 6. In conclusion, crossbred 2A had a lower growth performance in week 2; however, in weeks 4 and 6, 2A had a higher growth performance than that of the other groups. Based on this conclusion, we can use those results as a basis for further study.","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"8 1","pages":"733-739"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76109868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of tannin supplementation on growth performance and methane emissions of Hanwoo beef cows","authors":"Sinyong Jeong, Mingyung Lee, Seoyoung Jeon, Yujin Kang, H. Kang, S. Seo","doi":"10.7744/KJOAS.20180045","DOIUrl":"https://doi.org/10.7744/KJOAS.20180045","url":null,"abstract":"The objective of this study was to investigate the effects of dietary hydrolysable tannin on growth performance and methane emissions of Hanwoo beef cows. Fifteen cows participated in a seven-week experiment. The cows were stratified by initial methane emissions and assigned to one of two treatments: Control and tannin supplementation. Commercial hydrolysable tannin was top-dressed to a concentrate mix at 3 g/kg based on the dry matter. Enteric methane production was measured for 4 consecutive days at 1 week before and 1, 3 and 7 weeks after the initiation of the experiment using a laser methane detector. The feed intake was measured daily during the methane measurement periods and an additional two days prior to each measurement. The body weight of the cows was measured every 4 weeks. Hydrolysable tannin had no effect (p > 0.05) on body weight, average daily gain, dry matter intake (DMI) and feed conversion ratio. After one week, the methane emission of the tannin supplementation group was 3.66 ppm-m / kg DMI, which was about 3.4% lower (p = 0.078) than that of the control group; however, this tendency disappeared at 3 weeks after the start of the experiment (p > 0.05). The results of this study show that hydrolysable tannin supplementation can reduce enteric methane emissions for a limited period in Hanwoo beef cows. More research, however, is needed to determine the optimal level of hydrolysable tannin supplementation to reduce enteric methane emissions for a longer period without adversely affecting the animal performance of Hanwoo beef cattle.","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"16 1","pages":"463-473"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77077624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Livestock price change after anti-corruption law using VAR","authors":"Jeon Sang Gon, Sungsoo Ha, Kyunsik Lee","doi":"10.7744/KJOAS.20170066","DOIUrl":"https://doi.org/10.7744/KJOAS.20170066","url":null,"abstract":"The Anti-corruption Law has been enforced since Sep. 28, 2016 to prevent public servants from colluding with people for political favors and financial gain by giving bribes to public servants. Generally, most people in Korea think that the law has had a positive effect on society. Under this law, people believe that our society has become more transparent. However, domestic producers think the law has had negative effects on the Korean livestock industry. Statistics from the domestic livestock industry show that the Hanwoo price has dropped after the law was enforced. This study attempts to show how livestock prices in the Korean livestock industry have changed after the enactment of the law. We chose three important livestock industries, Hanwoo, pork, and chicken, to determine and compare the effects of the law on them. For the analysis, we used a time-series model, VAR, to incorporate the interactions of the three industries. We selected the average wholesale prices of these industries. Daily prices during the last 5 years were used to estimate and forecast the impacts of the law. The results show that the price of Hanwoo decreased after the enforcement of the law; however, the other livestock prices did not decrease. Additionally, we clearly saw this negative effect on the Hanwoo industry during the high demand season and New Year’s Day (solar and lunar together).","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"8 1","pages":"128-136"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84387617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of yeast culture (Saccharomyces cerevisiae) supplementation on growth performance, fecal score, and nutrient digestibility of weaning pigs","authors":"Xiao Liu, Tianshui Li, Kim In Ho","doi":"10.7744/kjoas.20180016","DOIUrl":"https://doi.org/10.7744/kjoas.20180016","url":null,"abstract":"Weaning pigs often face post-weaning challenges such as diarrhea, low feed intake, and body weight (BW) loss which affects the health and economic value of weaning pigs. Interestingly, the use of yeast cultures (YCs) as feed supplements for pigs has increased markedly in recent years. This study evaluated the effects of yeast cultures (Saccharomyces cerevisiae) on the growth performance, fecal score, and nutrient digestibility of weaning pigs. A total of 50 crossed healthy weaning pigs [(Yorkshire × Landrace) × Duroc] with an average BW of 7.46 ± 1.60 kg (28 day of age) were used in a 6-week experiment. The experiment was divided into 3 phases (Phase 1, 1 2 weeks; Phase 2, 2 4 weeks; Phase 3, 4 6 weeks). Dietary treatments were as follows: 1) CON: basal diet and 2) CON + 0.50% YC. During phase 1, the average daily gain (ADG) and average daily feed intake (ADFI) were significantly increased (p < 0.05) in the weaning pigs fed YC supplementation diets compared with the weaning pigs fed the CON diet. During phase 3 as well as overall, the gain/feed ratio (G/F) was significantly increased (p < 0.05) in the YC supplementation group compared with the pigs fed the CON diet. In conclusion, the supplementation of YCs in the diet positively affected the growth performance of weaning pigs during the first two weeks after weaning.","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"5 1","pages":"677-685"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75585374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Changes in ruminal fermentable characteristics and nutrient degradabilities of corn flake according to chamber type in Hanwoo: chamber type for corn flake in the rumen of Hanwoo","authors":"J. Ahn, 신종서, 정기용, 임환, 최장근, Ji-Hyung Kim, E. Kwon, 박병기","doi":"10.7744/kjoas.20180054","DOIUrl":"https://doi.org/10.7744/kjoas.20180054","url":null,"abstract":"This study was conducted to investigate the effect of a steam chamber type on the ruminal fermentable characteristics and nutrient degradabilities of corn flakes in Hanwoo. Three Hanwoo equipped with a ruminal fistula were used as experimental animals. There were two treatments: Corn flake using a steam chamber (CFSC, 1.0 atm 100°C 96 min) or corn flake using a pressurized steam chamber (CFPSC, 1.5 atm 111°C 12 min), respectively. In the in vitro trial, the ruminal pH was significantly lower in the CFPSC than in the CFSC (p < 0.01). The ammonia concentration was increased by 14.1% in the CFPSC compared to the CFSC (p < 0.05). The concentration of acetic acid was higher in the CFSC than in the CFPSC (p < 0.01). The concentrations of propionate, butyrate and total-VFA at 24 and 48 h were higher in the CFPSC than in the CFSC (p < 0.05). In the in situ trial, the degradability of dry matter was significantly higher in the CFSC than in the CFSC (p < 0.01). In addition, the degradabilities of starch and crude protein were significantly higher in the CFSC than in the CFSC (p < 0.01). Thus, the present results indicate that the pressurized steam chamber could be recommended to improve the feed value of corn flake according to the increase in the starch degradability and volatile fatty acid production.","PeriodicalId":17916,"journal":{"name":"Korean Journal of Agricultural Science","volume":"8 1","pages":"695-706"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90301744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}